In a small community consisting of 153 families, the number of families that have k children (k = 0, 1, 2, . . .) is given in the following table:
Number of Number of
children families
0…………………… 21
1…………………… 40
2…………………… 42
3…………………… 27
4 or more…………... 23
Determine the mean and the median of the number of children per family. (For the mean, assume that all families with four or more children have only four children. Why doesn’t this point matter for the median?)